Boiler construction



Dec. 4, 1934. R J. NEEDHAM ET AL 1,983,132

I BOILER CONSTRUCTION Filed June 12, 1934 O O O 33 p 1 I ZZ O O 0/6 \Q INVENTORS ZerZ cfl m Z0 7 I Eo u/ara WooZrzb/ye i; ir' AT RN Y I j Patented Dec. 4, 1934 l 7 r 1 UNITEDSTATESPATENT OFFICE 113 9 senseeessmeems j Robert J. Needham, Toronto, Ontario, Canada,

and Howard 0. Woodbridge, Rochester, N. Y.

Application June 12, 1934, Serial No. 730,280 1 10 c ai s. (Cl. 122- 1),

This invention relates to the construction of jecting forwardly a material distance into the boilers, and particularly to boilers of the 1000- fire box at or near the lower edge of the fire motive type, although it is applicable also to door opening 13. This extension has its top other types of boilers. 21' of fiat or substantially fiat form providing a 5 An object of the invention is to provide an-imshelf of substantial area, approximately the full proved boiler construction for use with mechaniwidth of the fire door, as shown in Fig. 2, and cal stokers. projecting a considerable distance forwardly into Another object is the provision of a boiler so the fire box, as shown in Figs. 1 and 3. From designed and constructed that the parts of a the forward edge of the fiat top 21, the sheet is 10 mechanical stoker projecting forwardly into the bent downwardly and rearwardly on a sufficiently fire box are shielded or protected so that they do large radius to avoid danger of cracking, and

not burn out as they have done heretofore. thence extends obliquely downwardly and rear- To these and other ends the invention resides wardly, as indicated at 22, at an .angle diverging in certain improvements and combinations of from the top 21, as plainly shown inFig. 1. Then 15 parts, all as will be hereinafter more fully dethe sheet bends again downwardly at a greater scribed, the novel features being pointed out in angle to the shelf portion 21, and merges into the the claims at the end of the specification. normal plane of the door sheet 12, all as plainly In the drawing: seen in the drawing. The extension is provided Fig. 1 isa vertical section taken substantially with suitable stay bolts 23 so that itmaywithstand i 20 centrally through a fragment of the rear end of the boiler pressure without bulging, and it will a boiler, showing one form of the invention; be seen that this extension is hollow and in free Fig. 2 is an elevation of a fragment of the rear communication with the rest of the water leg,

end of the boiler viewed from inside the fire box; so that it forms in effect a part of the water leg;

Fig. 3 is a plan of the parts shown in Fig. 2, and the water circulates freely in the extension 25 and l as well as in the rest or usual part of the water Fig. 4 is a vertical section similar to a part of leg.

Fig. 1, illustrating a modified form of the inven- Stay bolts 24 are provided, as usual, between tion. the back head 11 and the door sheet 12, wherever The same reference numerals throughout the required. 30 several views indicate the same parts. The top surface of the shelf 21 may itself form In t e drawing there is Shown a fragment of and be used as the distributor plate of the stoker, th ar d of a boiler of the tiv type, over which the fuel moves when projected forincludin the usual back head 11 and doorsheet wardly into the fire box. Suitable ribs or guides 12 which form between t t e bac Water leg for the fuel may be formed on or attached to the 35 of the boiler. The usual fir do opening 13 is top of the plate 21, if desired, as will be underprovided; it be by door, stood by those familiar with mechanical stokers. such as indicated n dotted lines at 14., The distributor plate, when formed in this man- In Flg- 1 there 15 shownm dotted lmes at 15 her will have an exceedingly long life in coma diagrammatic fi t i i E ii? f parison to prior distributor plates, because it is, 40 conventlonal mec amca' s 0 arm 1m to use in effect, part of the water leg of the boiler and 2 3;: ii gg gg g g? 52 3851 32 the metal is kept cool by reason of the circulathe fuel (usually coal or the like) to the fire door, mm m the water 5 that g i i and there it is placed upon a so-called distributor even though the Shelf 20 prolec s a ma plate along which it is moved, in known manner, tame t the fire so as to be projected forwardly into the fire box. If deslred, f the plate 21 Itself need not Heretofore, these distributor plates have probe used as the dlstrlbutor e but a sepalfate jected a substantial distance forwardly into the distributor plate 30, of any sultable oonstruotlon, fire box, in an overhanging position so that they overlie the Plate s S wn the alter- 50 are subjected to heat on all sides, and in service native Construction illustrated 1n F Thls they have usually burned out rather rapidly, neconstruction is equally satisfactory, because the cessitating frequent replacement. distributor plate 30, even though it may be of This burning out of the distributor plates is more or less conventional form, is protected by prevented according to the present invention by the water leg extension 20, which shields it from 55 providing, on the door sheet, an extension 20 prothe heat rising from below, so that the distributor opening is intended to refer to any opening through which fuel may be introduced into the fire box, whether such opening be commonly re ferred to as a fire door opening or by any other name.

We claim:

1. A boiler for use with a mechanical stoker, comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, and a hollow extension on said door sheet projecting forwardly substantially at the bottom of said fire door opening to form a shelf extending a material distance into the fire box, the interior of said extension being in communication with said water leg.

2. A boiler for use with a mechanical stoker, comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, said door sheet being formed to provide, adjacent the bottom of said fire door opening, an overhanging shelf of a width approx-- imating that of said fire door opening and a length projecting a material distance forwardly into the fire box.

3. A boiler for use with a mechanical stoker, comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, said door sheet being formed to provide, adjacent the bottom of said fire door opening, an overhanging shelf having a substantially fiat top extending forwardly a material distance into the fire box.

4. A boiler for use with a mechanical stoker, comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, said door sheet being formed to have a substantially flat portion extending forwardly a material distance into the fire box near the bottom of said fire door opening, said door sheet thence extending downwardly and obliquely rearwardly at an angle diverging from said fiat portion thereof, and thence downwardly at a sharper angle substantially parallel to said back head.

5. A boiler comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, and stoker distributor plate means including an extension formed on said door sheet providing a hollow overhanging shelf projecting a material distance forwardly into the fire box near the bottom of said fire door opening, the interior of said hollow shelf forming a part of said water leg and being in free communication with the rest of said water leg.

6. A boiler comprising a back head and a door sheet forming between them a water leg and provided with a fire door opening, and an extension formed on said door sheet providing a hollow overhanging shelf projecting a material distance forwardly into the fire box near the bottom of said fire door opening, the interior of said hollow shelf forming a part of said water leg and being in free communication with the rest of said water leg, and the top surface of said hollow shelf forming a distributor plate for a mechanical stoker.

7. A boiler comprising a back head and a door sheet forming between them a Water leg and provided with a fire door opening, an extension formed on said door sheet providing a hollow overhanging shelf projecting a material distance forwardly into the fire box near the bottom of said fire door opening, the interior of said hollow shelf forming a part of said water leg and being in free communication with the rest of said water leg, and a stoker distributor plate overlying said shelf and protected thereby from heat rising from below it.

8. A boiler fire box comprising two sheets forming between them a water leg having an opening therethrough, and a hollow extension on one of said sheets substantially at the bottom of said opening to form a shelf projecting a material distance into the fire box, the interior of said extension being in communication with said water leg.

9. A boiler fire box comprising two sheets forming between them a water leg having an opening therethrough, and a hollow extension on one of said sheets providing a hollow overhanging shelf projecting a material distance into the fire box near the bottom of said opening, the interior of said hollow shelf forming a part of said water leg and being in free communication with the rest of said water leg, and the top surface of said hollow shelf forming a distributor plate for a mechanical stoker.

10. A boiler fire box comprising two sheets forming between them a water leg having an opening therethrough, a hollow extension on one of said sheets providing a hollow overhanging shelf projecting a material distance into the fire box near the bottom of said opening, the interior of said hollow shelf forming a part of said water leg and being in free communication with the rest of said water leg, and a stoker distributor plate overlying said shelf and protected thereby from heat rising from below it.

ROBERT J. NEEDHAM. HOVJARD C. VVOODBRIDGE. 

